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JHU Cases and Deaths

  • Source name: jhu-csse
  • Number of data revisions since 19 May 2020: 1
  • Date of last change: 3 June 2020
  • Available for: county, hrr, msa, state (see geography coding docs)

This data source of confirmed COVID-19 cases and deaths is based on reports made available by the Center for Systems Science and Engineering at Johns Hopkins University.

Signal 7-day average signal Description
confirmed_cumulative_num confirmed_7dav_cumulative_num Cumulative number of confirmed COVID-19 cases
confirmed_cumulative_prop confirmed_7dav_cumulative_prop Cumulative number of confirmed COVID-19 cases per 100,000 population
confirmed_incidence_num confirmed_7dav_incidence_num Number of new confirmed COVID-19 cases, daily
confirmed_incidence_prop confirmed_7dav_incidence_prop Number of new confirmed COVID-19 cases per 100,000 population, daily
deaths_cumulative_num deaths_7dav_cumulative_num Cumulative number of confirmed deaths due to COVID-19
deaths_cumulative_prop deaths_7dav_cumulative_prop Cumulative number of confirmed due to COVID-19, per 100,000 population
deaths_incidence_num deaths_7dav_incidence_num Number of new confirmed deaths due to COVID-19, daily
deaths_incidence_prop deaths_7dav_incidence_prop Number of new confirmed deaths due to COVID-19 per 100,000 population, daily

These signals are taken directly from the JHU CSSE COVID-19 GitHub repository without changes. The 7-day average signals are computed by Delphi by calculating moving averages of the preceding 7 days, so e.g. the signal for June 7 is the average of the underlying data for June 1 through 7, inclusive.

This data is similar in intent to our USAFacts Cases and Deaths source, but as USAFacts collects and aggregates its data in slightly different ways, the data is not identical. Users should evaluate which source better fits their needs, or use the combination signal of both USAFacts and JHU data.

Table of contents

  1. Limitations
  2. Geographical Exceptions
    1. New York City
    2. Rhode Island
    3. Kansas City, Missouri
    4. Dukes and Nantucket Counties, Massachusetts
    5. Mismatched FIPS Codes

Limitations

JHU’s data reports cumulative cases and deaths, so our incidence signals are calculated by subtracting each day’s cumulative count from the previous day. Since cumulative figures are sometimes corrected or amended by health authorities, this can sometimes result in negative incidence. Health authorities can also change reporting standards in ways that dramatically increase the number of cumulative deaths, resulting in an apparent spike in incidence. This should be interpreted purely as an artifact of data reporting and correction.

Geographical Exceptions

Due to differences in state reporting standards, certain counties are not reported in the JHU data or are reported combined with other counties.

At the County (FIPS) level, we report the data exactly as JHU reports their data, to prevent confusing public consumers of the data. JHU FIPS reporting matches that used in the other signals, except for the following exceptions.

New York City

New York City comprises five boroughs, each of which is a county:

Borough Name County Name FIPS Code
Manhattan New York County 36061
The Bronx Bronx County 36005
Brooklyn Kings County 36047
Queens Queens County 36081
Staten Island Richmond County 36085

Data from all five boroughs are reported under New York County, FIPS Code 36061. The other four boroughs are included in the dataset and show up in our API, but always report zero cases and deaths.

All NYC counts are mapped to the MSA with CBSA ID 35620, which encompasses all five boroughs. All NYC counts are mapped to HRR 303, which intersects all five boroughs (297 also intersects the Bronx and 301 also intersects Brooklyn and Queens, but absent additional information, we chose to leave all counts in 303).

Rhode Island

As of June 2020, the JHU data does not report any cases or deaths for individual counties in Rhode Island. These cases and deaths are reported unassigned to any individual county, and are hence available in state-level estimates only.

Kansas City, Missouri

Kansas City intersects the following four counties, which themselves report confirmed case and deaths data:

County Name FIPS Code
Jackson County 29095
Platte County 29165
Cass County 29037
Clay County 29047

Data from Kansas City is given its own dedicated line, with FIPS code 70003. This is how JHU encodes their data. However, the data in the four counties that Kansas City intersects is not necessarily zero.

For the mapping to HRR and MSA, the counts for Kansas City are dispersed to these four counties in equal proportions.

Dukes and Nantucket Counties, Massachusetts

The counties of Dukes and Nantucket report their figures together, and we (like JHU) list them under FIPS Code 70002. Here are the FIPS codes for the individual counties:

County Name FIPS Code
Dukes County 25007
Nantucket County 25019

For the mapping to HRR and MSA, the counts for Dukes and Nantucket are dispersed to the two counties in equal proportions.

The data in the individual counties is expected to be zero.

Mismatched FIPS Codes

Finally, there are two FIPS codes that were changed in 2015 (see the Census Bureau documentation), leading to mismatch between us and JHU. We report the data using the FIPS code used by JHU, again to promote consistency and avoid confusion by external users of the dataset. For the mapping to MSA and HRR, these two counties are included properly.

County Name State “Our” FIPS JHU FIPS
Oglala Lakota South Dakota 46113 46102
Kusilvak Alaska 02270 02158